has_predicate association has predicate Propositional statements can be represented in RDF as directional subject-predicate-object (S-P-O) triples. RDF reification vocabularies such as OBAN create named individuals in a graph that represent such S-P-O propositional statements. In OBAN, these are called 'associations', and the semantics of these associations can be represented using properties that link it to the subject, predicate, and object of the triple it represents. This property is defined by OBAN to specifically link 'associations', which are proposition-level entities, to the property representing the predicate of the reified triple. It is therefore a more specific relation than its has_predicate parent, which can be used to link a statement or proposition to its predicate. association